#include <iostream>
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <string>
#include <sstream>

using namespace std;

int main(int argc, char **argv)
{
    cout << "this is a" << endl;
    string fint = "23.4";
    string coustr = "";

    float ffloat = 0;
    stringstream ss;
    ss << fint;
    ss >> ffloat;
    cout << ffloat << endl;
    ss.clear();
    ss << "first";
    ss << "second";
    cout << ss.str() << endl;
    return 0;
}